Children attend a traditional martial arts class at China National Children’s Center in Beijing, capital of China, May 17, 2018. [Photo/Xinhua]

Children attend a traditional etiquette class at China National Children’s Center in Beijing, capital of China, May 17, 2018. [Photo/Xinhua]

Children attend a calligraphy class at China National Children’s Center in Beijing, capital of China, May 17, 2018.[Photo/Xinhua]